The book was written in collaboration with the Buitenplaatsen en Historische Landschappen foundation. It has an appendix that provides a description of the life and work of the Van Nieukerkens and their contributions to restorations to various country houses. It includes a list of their most important works. | The book describes the Overijssel buitenplaatsen, divided into the havezathen, the country estates of patricians, country palaces and modern country houses, and the country houses of Twente fabriqueurs. Thus, several country houses designed by Karel Muller are discussed. Country house Egheria in De Lutte was bombed in 1944 and, although smaller, rebuilt.